Water Drainage System

ABSTRACT

The current invention discloses a water drainage system designed for securing a waterproof membrane as well as centering a wastewater pipe. The water drainage system has a coupling mechanism including a lower drain body and a pipe-capturing member. The lower drain body may be installed in a substrate medium, such as a shower pan, onto which a waterproof membrane would be fixed. The pipe-capturing member has two frusto-conical designs which allow the pipe-capturing member to be firmly asserted into the lower drain body and at the same time center and secure the wastewater pipe. The pipe-capturing member and the lower drain body each has a flange wherein the two flanges trap and secure the waterproof member in place. Additional structures such as a drain trim holder may also be adopted to allow easier adjustment. The current invention is particularly useful for shower pan drainage.

CLAIM OF PRIORITY

This application is a US utility application and claims priority to U.S. provisional patent application 61/624,130 filed on Apr. 13, 2012, the contents of which are fully incorporated by reference.

FIELD OF THE INVENTION

This invention relates to a water drainage system. More particularly, the current invention relates to a water drainage system that may be used with a waterproof membrane to center and secure a waste water pipe in place.

BACKGROUND OF THE INVENTION

Water drainage systems are common in every household. It is desirable to have a drain system that is clean, easy to install and adjust, safe, and inexpensive. Examples in the art of water drainage systems are inflexible and hard to adjust. Most are designed for singular purposes while limiting the possible uses with design flaws that exclude certain installation locations and functions as well as having complicated designs with a multitude of parts and areas of potential failure. The current invention fulfills the needs over previous disclosures, providing improvements and convenience in regard to align the drain system with the floor, and how to ensure no residual wastewater accumulates.

DESCRIPTION OF THE RELATED ART

U.S. Pat. No. 8,060,956 to DeGooyer presents a bondable waterproof fabric membrane shower pan system. This system combines the use of a prefabricated pitched subfloor with a waterproof fabric membrane also comprising of a coupling drain system which attaches to the wastewater pipe. The design has multiple connection points where mechanical connections must be made in order to create a waterproof connection where two level surfaces meet. Since the system starts with a large flange on the bottom for connecting to a shower floor subfloor, it eliminates the possibility of fitting the lower drain body into a surface such as a roof. This mandates that you must build your final surface up to the height necessary for proper drainage.

U.S. Pat. No. 4,562,602 to Cuschera presents a wide floor water drainage system to fit with a small waste water pipe. This design depicts an adaptor for a waste water capturing method wherein a large conical shaped pipe is inserted into the surface to be drained and where in a smaller pipe section is inserted from above into the larger pipe section. The pipes are secured and sealed together with several rubber gaskets as well as two exterior nuts to be attached from the bottom. This design in theory tries to accomplish the same goals wherein a small section of pipe is inserted into a larger pipe section where the waste water pipe is captured and centered. Since the adaptor is secured with nuts from the bottom of the subfloor surface, access to the drain from the floor below is necessary and damage may be done to the ceiling. This design also fails to allow for the capturing of waterproof membranes which will greatly increase the efficiency of the seals as well as creating a secure moisture barrier.

Various implements are known in the art, but fail to address the entire problem solved by the invention described herein. A preferred embodiment of this invention is illustrated in the accompanying drawings and will be described in more detail herein below.

SUMMARY OF THE INVENTION

According to this invention, a water drainage system is disclosed for use with a waterproof membrane covering a substrate medium above the floor wherein a wastewater pipe is installed. The water drainage system mechanically secures the water proof membrane and at the same time centers and anchors the waste water pipe. The major component of the water drainage system of the current invention comprises a coupling mechanism including a lower drain body and a pipe-capturing member. The coupling mechanism traps a waterproof membrane covering the surfaces onto which wastewater may be disposed. Together with several additional structures, the coupling mechanism ensures that the waste water flows into the waste water pipe that is secured in place.

In particular, the current invention includes a large lower drain body encircling a receiving hole, the lower drain body having a top surface which pitches radially inward and downward toward the center. The lower drain body has a lower drain flange on the top portion of the lower drain body, the lower drain flange extending downward from the top surface. Below the lower drain flange, the lower drain body has a cylindrical section which is dramatically thinner than the lower drain flange in terms of center-to-exterior thickness. The lower part of the cylindrical section is preferably threaded, defining a threaded section generally designed to be connected to an anchoring nut having a threaded interior.

The water drainage system further comprises a pipe-capturing member, the pipe-capturing member having a tubular section with a significant interior-to-exterior thickness and a top flange positioned above the tubular section, the top flange being thin in top-to-bottom thickness and extending outwardly. The tubular section and the top flange encircle a pipe hole, which may be used to receive the insertion of a waste water pipe. The exterior surface of the tubular section decreases in diameter from top to bottom while the interior diameter of the tubular section increases from top to bottom. The diameter change of the interior surface allows the pipe-capturing member to firmly capture a waste water pipe and center the pipe. Similarly, the diameter change of the exterior surface allows the pipe-capturing member to be firmly inserted into the lower drain body. The bottom surface of the top flange of the pipe-capturing member is pitched as to be parallel with the upper surface of the lower drain body. Within this parallel space a waterproof membrane can be trapped or mechanically connected, additionally the same parallel space has pitched weeping channels through the body of the pipe-capturing member, allowing seepage to find its way to the waste water pipe. At the point where the membrane meets the exterior tubular section of the capturing member, a plurality of weeping holes are located around the tubular section under the top flange to allow water to pass through into the waste water pipe. The capturing member may also include threaded inserts in order to secure a drain trim.

Aside from the pipe-capturing member and the lower drain body, other structures may be included in the water drainage system disclosed by the current invention. A drain trim holder may be placed above the pipe-capturing member, the drain trim holder being preferably adjustable in height to level the water drainage system with the finished floor. A drain trim cover may be adopted to cover the drain trim holder. In addition, an anchoring nut may be used to secure the lower drain body to the ground.

The current invention may cover a number of embodiments having variable components. One key feature is that two structures may embrace and held flush against a waterproof membrane. A separate but important aspect of the current design is to allow modest but important positioning of the drain trim holder, thus making the placement of the water outlet adjustable.

In general, the present invention succeeds in conferring the following, and others not mentioned, desirable and useful benefits and objectives.

It is an object of the present invention to provide a water drainage system that is safe and easy to install.

It is another object of the present invention to provide a water drainage system that secures a waste water pipe in place.

It is another object of the present invention to provide a water drainage system that may be used in combination with a waterproof membrane covering the floor.

Yet another object of the present invention is to provide a water drainage system that may be easily adjusted in terms of position.

Still another object of the present invention is to provide a water drainage system that does not cause water accumulation.

It is another object of the present invention to provide a water drainage system that is robust and durable.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top perspective view of the water drainage system of the present invention fully assembled in a subfloor medium.

FIG. 2 is an exploded view of the water drainage system of the present invention.

FIG. 3 is an exploded sectional view of the water drainage system of the present invention.

FIG. 4 is a sectional view of the water drainage system of the present invention when the water drainage system is fully assembled in a subfloor medium.

FIGS. 5 A-H provide a full illustration of the pipe-capturing member, wherein

FIG. 5A is a top perspective view,

FIG. 5B is a top view,

FIG. 5C is a bottom view,

FIG. 5D is a front view,

FIG. 5E is a back view,

FIG. 5F is a first side view,

FIG. 5G is a second side view,

FIG. 5H is a sectional side view;

FIG. 6 A-H provide a full illustration of the lower drain body, wherein

FIG. 6A is a top perspective view,

FIG. 6B is a top view,

FIG. 6C is a bottom view,

FIG. 6D is a front view,

FIG. 6E is a back view,

FIG. 6F is a first side view,

FIG. 6G is a second side view,

FIG. 6H is a sectional side view;

FIG. 7 is an exploded sectional view of an alternative embodiment of the water drainage system of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiments of the present invention will now be described with reference to the drawings. Identical elements in the various figures are identified, as far as possible, with the same reference numerals. Such embodiments are provided by way of explanation of the present invention, which is not intended to be limited thereto. In fact, those of ordinary skill in the art may appreciate upon reading the present specification and viewing the present drawings that various modifications and variations can be made thereto without deviating from the innovative concepts of the invention.

FIG. 1 is a top perspective view of the water drainage system of the present invention fully assembled in a subfloor medium. Shown in FIG. 1 is the substrate medium 12 into which the water drainage system is installed. The substrate medium 12 is shown in partially cut-away view for clarity purposes. Also shown in FIG. 1 are a drain trim holder 40 and a drain plate 18, the parts of a water drainage system of the current invention that is visible when it is assembled. The preferred embodiment of the current invention may generally be installed in substrate medium 12 at the location of a wastewater pipe. Also referring to FIG. 1, the substrate medium 12 is covered by waterproof membrane 19, which is a novel design to overlay a surface onto which wastewater may be disposed. For example, the waterproof membrane may be used to cover the bathroom floor or bathtub. FIG. 1 is the overview for water drainage system after installation is completed. The line between points A and B serves as an indicator for the sectional views of the water drainage system in FIGS. 3, and 4.

FIG. 2 is an exploded view of the water drainage system of the present invention. FIG. 3 is an exploded sectional view of the water drainage system of the present invention, with the sectional line marked between points A and B in FIG. 1. FIG. 4 is a sectional view of the water drainage system of the present invention when the water drainage system is fully assembled. As a group, FIGS. 2, 3, and 4 demonstrate how the entire water drainage system would assemble and show essentially the same elements, including a drain plate 18, a drain trim holder 40, a pipe-capturing member 15, a waterproof membrane 19, a lower drain body 14, and an anchoring nut 32, with specific emphasis on different details of these element.

As shown in FIG. 2 and FIG. 3, the water drainage system includes a lower drain body 14 encircling a receiving hole 36. The lower drain body has a generally tubular, cylindrical section 21 wherein its lower part is threaded, defining a threaded section 33. On top of the cylindrical section 21, the lower drain body 14 has a lower drain flange 28 that expands annularly, and the lower drain flange 28 has a significantly larger diameter than the cylindrical section 21. The lower drain body 14 also has a top surface 31 above the lower drain flange 28, the top surface 31 pitching downward and inward radially towards the center of the receiving hole 36, creating a sloped surface that may funnel water to flow through dedicated channels into a waste water pipe. Referring to FIG. 4, the top outer edge of the lower drain flange 28 should be substantially flush with the top surface of the subfloor medium 12 onto which a waterproof membrane 19 may be attached.

As shown in FIG. 2 and FIG. 3, the water drainage system includes a pipe-capturing member 15 encircling a pipe hole 35, the pipe-capturing member 15 having a tubular section 22 and a top flange 20 positioned on the tubular section 22. The top flange 20 has an upper surface 24 and a lower surface 27. Referring to FIG. 3, the lower surface 27 of the top flange 20 on the pipe-capturing member 15 has an annular pitch that matches the pitch of the top surface 31 of the lower drain body 14, allowing flush contact between the lower surface 27 of the top flange 20 and the top surface 31 of the lower drain body 14 when the tubular section 22 of the pipe-capturing member 15 is inserted into the receiving hole 36 of the lower drain body 14, if no membrane is separating the two structures.

One of the basic functions that may be served by the water drainage system is to provide draining for an area that is covered by a waterproof membrane 19. As indicated above, the waterproof membrane 19 is a unique design for coverage of surfaces that may be susceptible to flow or accumulation of waste water. The pipe-capturing member 15 and the lower drain body 15 may serve as a coupling mechanism for the waterproof membrane 19. As shown in FIG. 2 and FIG. 3, the top flange 20 of the pipe-capturing member 15 has a pitched lower surface 27 that matches the pitched top surface 31 of the lower drain body 14. The tubular section 22 of the pipe-capturing member 15 may be inserted through a hole 37 on the waterproof membrane 19, and into the receiving hole 36 of the lower drain body 14, wherein the hole 37 on the waterproof membrane 19 has a diameter similar to the exterior diameter of the tubular section 22, thus trapping the waterproof membrane 19 underneath the top flange 20 and above the lower drain flange 28. Since the lower surface 27 of the top flange 20 has matching pitch angles as the top surface 31 of the lower drain body 14, the coupling of the pipe-capturing member 15 and the lower drain body 14 causes the trapped section 25 of the waterproof membrane 19 to pitch as shown in FIG. 2-4, allowing close contact between the components.

Referring to FIG. 3 and FIG. 4, the exterior surface of the tubular section 22 of the pipe-capturing member 15 is tapered and decreases in diameter from the top, defined as the part closer to the top flange 20, to bottom, making the exterior of the tubular section 22 a frusto-conical shape. Conversely, the interior diameter of the tubular section, which corresponds to the diameter of the pipe hole 35, increases from top to bottom, making the pipe hole 35 a frusto-conical shape.

The tapering of the interior and exterior diameters of the tubular section 21 of the pipe-capturing member 15 is generally not very significant. The tapering angles for the interior and exterior diameters are between 0.1-5°, with the preferred tapering angle to be around 1°. Thus, due to the small tapering angle, the changes of the diameters are not dramatic.

Since the exterior diameter of the tubular section 22 of the pipe-capturing member 15 is tapered and decreases from top to bottom, it has a maximum exterior diameter positioned just beneath the top flange 20. The maximum exterior diameter is substantially equal to the diameter of the receiving hole, which is substantially uniform. Referring to FIG. 3 and FIG. 4, the tubular section 22 of the pipe-capturing member 15 may be inserted into the receiving hole 36 of the lower drain body 14 from the top. Since the exterior diameter on the lower part of the tubular section 22 is smaller than the diameter of the receiving hole 36, the insertion is made easier. Moreover, the tapered exterior surface of the tubular section 22 permits application of a chemical bonding adhesive between the tubular section 22 and the interior of the lower drain body 14 without causing squeezing away of the adhesive when the tubular section 22 is being inserted into the receiving hole 36.

Since the interior diameter of the tubular section 22 of the pipe-capturing member 15 is tapered and increases from top to bottom, it has a minimum interior diameter positioned just beneath the top flange 20. The minimum exterior diameter is preferred to be substantially equal to the generally uniform outside diameter of a wastewater pipe, which is to be inserted into the pipe hole 35 from the bottom. The tapered interior surface of the tubular section 22 makes the insertion of a wastewater pipe easier. Moreover, the tapered interior surface of the tubular section 22 permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the wastewater pipe is inserted into the pipe hole 35 of the pipe-capturing member.

As shown in FIG. 3, the top flange 22 of the pipe-capturing member has an upper interior edge 29, the upper interior edge 29 is shaped as a chamfer that extends radially, forming a funnel shape. Such a design facilitates the flowing of wastewater into the wastewater pipe, which is inserted into the pipe hole 35 of the pipe-capturing member 15.

Referring to FIGS. 2, 3 and 4, the pipe-capturing member 15 has weeping holes 17 though the body of the pipe-capturing member 15. Each of the weeping holes 17 has one opening just beneath the top flange 22, with another opening on the chamfer of the interior edge 29. The weeping holes 17 are positioned at an angle to facilitate draining into the pipe hole 35 and the wastewater pipe in the pipe hole 35. As shown in FIG. 4, the diameter of the top flange 22 is preferably smaller than the diameter of the lower drain flange 28, making the waterproof membrane 19 to taper at location 34, which is also shown in FIGS. 2 and 3. The tapering of the waterproof membrane 19 at location 34 creates a pocket, which may facilitate the flowing of wastewater to the water drainage system. Most of the waste water may make its way above the pipe capturing member 15, over the chamfer 29 and into the wastewater pipe. Even if there is any wastewater flowing under the top flange 20, it will still escape through the weeping holes 17 and into the wastewater pipe.

As shown in FIGS. 2, 3 and 4, the water drainage system may further comprises an anchoring nut 32, which has a threaded interior that may be fastened to the threaded section 33 of cylindrical section 21 of the lower drain body 14. Referring to FIG. 4, the anchoring nut 32 may be placed beneath the substrate medium 12, creating further stabilization to the water drainage system, making it more difficult to dislocate the lower drain body 14, the pipe-capturing member 15, and other components of the water drainage system. However, it should be noted that the lower drain body 14 may be connected to the anchoring nut 32 with other approaches, such as but not limited to: co-molding and gluing. The anchoring nut 32 may also be entirely left out if the water drainage system is sufficiently secured.

As shown in FIGS. 2, 3 and 4, the water drainage system may further include a drain trim holder 40, which may be positioned on top of the pipe-capturing membrane 15. The drain trim holder 40 may have different designs according to specific needs. In the embodiment shown in FIGS. 2-4, the exterior wall 41 of the drain trim holder 40 has a saw tooth design and the interior wall 43 of the drain trim holder 40 has a square tooth design. These designs allow the height of the drain trim holder 40 to be adjusted depending on the thickness of the material to be used on the finished floor, into which the water drainage system is installed. Referring specifically to FIG. 3, a bottom wall 45 of the drain trim holder 40 is sloped towards the center to create a funnel shape to ensure that the waste water that enters the drain trim holder will flow to the waste water pipe. There is a drain hole 44 on the bottom wall 45 of the drain trim holder 40. The diameter of the drain hole 44 is substantially equal to the diameter of the waste water pipe that is to be inserted into the water drainage system. Upon installation, the drain hole 44, the pipe hole 35, and the receiving hole 36 are aligned to create a channel for wastewater collection and outflow.

As shown in FIGS. 2-4, the water drainage system may also include a drain plate 18 and mounting screws 16. The drain plate 18 may be used to cover the drain trim holder 40. The drain plate 18 has multiple openings through its body, allowing flow of water into the water drainage system. The drain plate 18 may be pressure fit into the drain trim holder 40 after the drain trim holder 40 has been cut or lifted to the appropriate height of the finishing surface. The mounting screws 16 may attach the drain plate holder 40 to the pipe-capturing member 15. As shown in FIG. 3 and FIG. 4, there are adjustment holes 42 in the drain trim holder 40 and vertical screw holes 26 in the pipe-capturing member 15. The diameter of the adjustment holes 42 are significantly larger than the diameter of the mounting screws 16 so that the position of drain trim holder 40 may be adjusted for the ideal location of the drain trim plate. From a top view, the drain plate 18 and the drain trim holder 40 may be a square shape. Upon installation, the drain trim plate 18 is fit into the top of the square drain trim holder 40 which is secured with the mounting screws 16 to pipe-capturing member 15.

As indicated above, it is preferred that the tubular section 22 of the pipe-capturing member 15 is inserted into the receiving hole 36 of the lower drain body. It is also preferred that the lower drain body 14 and the pipe capturing member 15 are attached with adhesives. Similarly, a wastewater pipe may be inserted into the interior of the pipe-capturing member 15 and attached to the pipe-capturing member 15 with adhesives. It should also be noted that adhesives may not be the only approach to join the three structures. For example, sonic-welding, as well as other methods, may also be utilized as long as effective attachment may be obtained.

In terms of materials, the various components of the water drainage system may be made from same or different materials. It is desirable that the materials are waterproof, durable, robust, easy to mold, and relatively inexpensive. The materials that may be used include but are not limited to: metal, rubber, and plastic such as, but not limited to, polyethylene terephthalate (PET), polyethylene (PE), high-density polyethylene, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), low-density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), high impact polystyrene (HIPS) and polycarbonate (PC), or some combination thereof. The preferred material for making the lower drain body 14 and the pipe-capturing member is PVC.

FIGS. 5 A-H provide a full illustration of the pipe-capturing member 15, wherein FIG. 5A is a top perspective view, FIG. 5B is a top view, FIG. 5C is a bottom view, FIG. 5D is a front view, FIG. 5E is a back view, FIG. 5F is a first side view, FIG. 5G is a second side view, FIG. 5H is a sectional side view.

FIGS. 6 A-H provide a full illustration of the lower drain body 14, wherein FIG. 6A is a top perspective view, FIG. 6B is a top view, FIG. 6C is a bottom view, FIG. 6D is a front view, FIG. 6E is a back view, FIG. 6F is a first side view, FIG. 6G is a second side view, and FIG. 6H is a sectional side view.

FIG. 7 is an exploded sectional view of an alternative embodiment of the water drainage system of the present invention. The embodiment shown in FIG. 7 shares significant similarities with the embodiment shown in FIGS. 1-6. In addition, this embodiment provides certain features that are in some aspects more advantageous.

Shown in FIG. 7 are a drain plate 18, a drain trim holder 51 having a stepped inner flange 53, an inner connecting member 70, a first busing 54, a second bushing 57, an outer capturing member 60, a waterproof membrane 19, a lower drain body 14, an adaptor 80, and an anchoring nut 32. Here, the structures some components, such as the anchoring nut 32 and the drain plate 18, are similar to the same elements shown in FIGS. 2, 3, and 4.

The lower drain body 14 encircles a receiving hole 36 having a generally uniform first diameter, a top part of the lower drain body 14 being a lower drain flange 28 that extends radially outwardly, the lower drain flange 28 having an upper surface sloped to the center of the receiving hole 36, the lower drain body 14 further having a cylindrical section 21 below the lower drain flange 28.

The outer capturing member 60 has an outer capturing member tubular section 64 encircling an outer capturing member hole 66 and an outer capturing member top flange 63 that extends radially outward. The tubular section 64 of the outer capturing member 60 has an exterior diameter and an interior diameter. The outer capturing member top flange 63 is positioned on top of the tubular section 64 and has a sloped lower surface. The sloped lower surface of the outer capturing member top flange 63 is substantially parallel to the upper surface of the lower drain flange 28. The tubular section 64 of the outer capturing member 60 may be inserted into the receiving hole 36 of the lower drain body 14. The outer capturing member top flange 63 and the lower drain flange 36 of the lower drain body 14 hold flush and secure the waterproof membrane 19, which covers a substrate medium. Different from the embodiment shown in FIG. 2-4, here the tubular section 64 of the outer capturing member 60 extends below a lower end of the lower drain body 14. The lower part of the outer capturing member tubular section 64 is threaded. The adapter 80 and the anchoring nut 32 may be attached to the threaded part of the outer capturing member tubular section 64, with the anchoring nut 32 preferably screwed to the threaded part.

The inner connecting member 70 has an inner connecting member tubular section 71 encircling an inner connecting member hole 75 and an inner connecting member top flange 72 that extends radially outward. The inner connecting member tubular section 71 may be inserted through the drain trim holder 51 so that the inner connecting member top flange 72 rests on the stepped inner flange 53 of the drain trim holder 32. The inner diameter of the hole in the drain trim holder 51 is modestly larger than the exterior diameter of the inner connecting member tubular section 71, with a difference preferably ranges between 2 to 50 mm. With this feature, the inner connecting member 70 allows the drain trim holder 51 to be modestly repositioned when the inner connecting member 70 is inserted through the drain trim holder 51. Such a feature may reduce work load to avoid tile cutting, if tiles are used. Similar to the weeping holes shown in FIGS. 2-4, there may also be weeping holes 17 through the inner connecting member tubular section 72, wherein the weeping hole 17 may be used for the drainage of residue water.

The first bushing 54 and the second bushing 57 are inserted into the outer capturing member hole 66, with the first bushing 54 being positioned above the second bushing 57. The first bushing 54 and second bushing 57 are made from flexible and waterproof materials such as rubber. In addition, the first bushing 54 and the second bushing 57 have circling protrusions that ensure capturing. The inner connecting member tubular section 71 may be inserted into the first bushing 54 and being secured by the first bushing 54. A pipe may extend through the second bushing 57. capturing member, the weeping holes having openings on the radial chamfer of the upper interior edge of the pipe-capturing member and having an angle to facilitate draining into the pipe hole, and the integral weeping holes in the pipe-capturing member are substantially parallel to the top surface of the upper flange of the pipe capturing member.

The water drainage system may also include other structures to form a more comprehensive and complete design for improvement of a household drainage assembly. For example, the water drainage system may include a shower pan that may be combined with the pipe centering and membrane securing mechanisms such as the lower drain body 14 and the pipe-capturing member 15 (FIG. 3) or the lower drain body 14 and the outer capturing member 60 (FIG. 7). The shower pan is installed over a subfloor or an underlayment that in most cases comprises plywood or other support structures.

On key component of the shower pan is the substrate medium 12 as shown in FIGS. 1 and 4. The substrate medium is made from durable and water-resist materials such as but not limited to: metal, rubber, and plastic such as, but not limited to, polyethylene terephthalate (PET), expanded polystyrene (EPS), polyethylene (PE), high-density polyethylene, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), low-density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), high impact polystyrene (HIPS) and polycarbonate (PC), or some combination thereof. The preferred material for the substrate medium 12 is EPS. The substrate medium is molded to have a slightly sloped surface, wherein the lowest point in the shower pan coincides with the location of the inlet of the wastewater pipe. A waterproof membrane 19 covers the substrate medium 12 as shown in FIGS. 1 and 4, providing a separating layer between the substrate medium 12 and water flow. The waterproof membrane 19 is preferred to be self adhesive. However, other methods may be used to attach the waterproof membrane 19 to the substrate medium 12. The waterproof membrane 19 has the same features.

The shower pan may also include a curb completely or partially surrounding the substrate medium. The curb may be made from the materials identified above or plastic wood composite. It is desirable that the curb be made from water resistant materials. The curb is thicker than the substrate medium and as a combined structure the curb and the substrate medium define the contours of the shower pan. It is preferable that the waterproof membrane also covers the curb. In addition, the waterproof membrane may expand upward against the splash wall adjacent to which the shower pan is installed, providing an extensive waterproof surface.

The waterproof membrane may be folded or cut to match the surfaces of the shower pan and the splash wall. The preferred method is to fold the membrane because such an approach does not leave gaps that may cause accumulation of moisture on the inner surfaces and in the inner voids. The splash wall, which may also be considered a part of the water drainage system, may provide the space needed for disposing the fold-up portion of the waterproof membrane that is not used to provide cover to the water drainage system. The splash wall may have a splash wall void behind it or between sub-layers of the splash wall. There are multiple ways to fold the waterproof membrane. The fold-up portion of the waterproof membrane may be folded into the splash wall void, keeping the appearance of the shower pan clean and neat, also preventing necessary cutting of the waterproof membrane.

Although this invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made only by way of illustration and that numerous changes in the details of construction and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention. 

What is claimed is:
 1. A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising: a lower drain body encircling a receiving hole having a first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange; a pipe-capturing member having a generally tubular section encircling a pipe hole and a top flange that extends radially outward, the tubular section having an exterior diameter and an interior diameter, the top flange being positioned on top of the tubular section; wherein the tubular section of the pipe-capturing member is inserted into the receiving hole of the lower drain body, and the top flange has a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange.
 2. The water drainage system of claim 1, wherein the exterior diameter of the tubular section is tapered and decreases from top, defined as the part closer to the top flange, to bottom, allowing the pipe-capturing member to be inserted into receiving hole of the lower drain body, and the interior diameter of the tubular section is tapered and increases from top to bottom, allowing the pipe-capturing member to secure and center a waste water pipe.
 3. The water drainage system of claim 2, wherein the tubular section of the pipe-capturing member has a maximum exterior diameter substantially equal to the first diameter of the receiving hole, and the tapered exterior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the tubular section is inserted into the receiving hole.
 4. The water drainage system of claim 2, wherein the tubular section of the pipe-capturing member has a minimum interior diameter substantially equal to the outside diameter of the waste water pipe, and the tapered interior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the waste water pipe is inserted into the pipe hole of the pipe-capturing member.
 5. The water drainage system of claim 1, wherein the cylindrical section of the lower drain body has a lower part that has a threaded exterior surface, defining a threaded section.
 6. The water drainage system of claim 5, further comprising an anchoring nut having a threaded interior, the anchoring nut being fastened to the threaded section of the lower drain body for the purpose of securing the lower drain body to a substrate.
 7. The water drainage system of claim 1, wherein the top flange of the pipe-capturing member has an upper interior edge, the upper interior edge is shaped as a radial chamfer, forming a funnel shape, there are integral weeping holes through the pipe-capturing member, the weeping holes having openings on the radial chamfer of the upper interior edge of the pipe-capturing member and having an angle to facilitate draining into the pipe hole, and the integral weeping holes in the pipe-capturing member are substantially parallel to the top surface of the upper flange of the pipe capturing member.
 8. The water drainage system of claim 1, further comprising a substrate medium surrounding the lower drain body, the substrate medium has a top surface and the top surface slopes to a lowest middle point, wherein the lowest middle point in the substrate medium coincides with the location of an inlet of a wastewater pipe
 9. The water drainage system of claim 8, further comprising a drain trim holder having horizontal saw tooth exterior walls, square tooth interior walls, and a flat bottom surface, the drain trim holder being positioned above the pipe-capturing member.
 10. The water drainage system of claim 11, further comprising a drain plate and mounting screws, wherein the drain plate being positioned over the drain trim holder, there are vertical holes on the pipe-capturing member, and the mounting screws connect the drain trim holder to the pipe-capturing member by insertion into the vertical holes.
 11. The water drainage system of claim 10, wherein there are screw holes on the drain trim holder for the insertion of the mounting screws, the screw holes being substantially bigger than the diameter of the mounting screws, allowing limited re-positioning of the drain plate.
 12. A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising a lower drain body encircling a receiving hole having a generally uniform first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange; a pipe-capturing member having a generally tubular section encircling a pipe hole and a top flange that extends radially outward, the tubular section has an exterior diameter and an interior diameter, the top flange being positioned on top of the tubular section and having a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange; an anchoring nut; a drain trim holder; and a drain plate; wherein the exterior diameter of the tubular section is tapered and decreases from top, defined as the part closer to the top flange, to bottom, allowing the pipe-capturing member to be inserted into the receiving hole of the lower drain body, the interior diameter of the tubular section is tapered and increases from top to bottom, allowing the pipe-capturing member to secure and center a waste water pipe inserted into the pipe hole, the top flange of the pipe-capturing member and the lower drain flange of the lower drain body hold flush and secure the waterproof membrane, which covers a substrate medium, the anchoring nut is attached to the cylindrical section of the lower drain body, the drain trim holder is positioned above the pipe-capturing member, and the drain plate covers the drain trim holder.
 13. The water drainage system of claim 12, wherein: the top flange of the pipe-capturing member has an upper interior edge, the upper interior edge is shaped as a radial chamfer, forming a funnel shape, and there are integral weeping holes the pipe-capturing member, the weeping holes having openings on the radial chamfer of the upper interior edge of the pipe-capturing member and having an angle to facilitate draining into the pipe hole.
 14. The water drainage system of claim 13, wherein: the tubular section of the pipe-capturing member has a maximum exterior diameter substantially equal to the first diameter of the receiving hole, and the tapered exterior surface permits application of a chemical bonding adhesive without causing squeezing away of the adhesive when the tubular section is inserted into the receiving hole.
 15. The water drainage system of claim 14, wherein: the cylindrical section of the lower drain body has a lower part that has a threaded exterior surface, defining a threaded section, and the anchoring nut has a threaded interior, the anchoring nut being fastened to the threaded section of the lower drain body for the purpose of securing the lower drain body to a substrate.
 16. A water drainage system to secure a wastewater pipe and a waterproof membrane, comprising: a lower drain body encircling a receiving hole having a generally uniform first diameter, a top part of the lower drain body being a lower drain flange that extends radially outwardly, the lower drain flange having an upper surface sloped to the center of the receiving hole, the lower drain body further having a cylindrical section below the lower drain flange; an outer capturing member having an outer capturing member tubular section encircling an outer capturing member hole and an outer capturing member top flange that extends radially outward, the tubular section having an exterior diameter and an interior diameter, the outer capturing member top flange being positioned on top of the tubular section and having a sloped lower surface, the sloped lower surface is substantially parallel to the upper surface of the lower drain flange; an inner connecting member having a inner connecting member tubular section encircling an inner connecting member hole and an inner connecting member top flange that extends radially outward; an anchoring nut; an adapter; a first bushing and a second bushing; a drain trim holder having a stepped inner flange; and a drain plate; wherein the exterior diameter of the outer capturing member tubular section is tapered and decreases from top, defined as the part closer to the outer capturing member top flange, to bottom, allowing the outer capturing member to be inserted into the receiving hole of the lower drain body, a lower section of the outer capturing member tubular section is threaded, the first bushing and the second bushing are inserted into the outer capturing member hole, the first bushing being above the second bushing, the inner connecting member tubular section fits through the drain trim holder into the first bushing, the outer capturing member top flange and the lower drain flange of the lower drain body hold flush and secure the waterproof membrane, which covers a substrate medium, the adapter and the anchoring nut are attached to the threaded part of the outer capturing member tubular section, and the drain plate covers the drain trim holder.
 17. The water drainage system of claim 16, there are weeping holes through the inner connecting member tubular section.
 18. The water drainage system of claim 16, wherein the inner connecting member allows the drain trim holder to be repositioned when the inner connecting member is inserted through the drain trim holder.
 19. The water drainage system of claim 16, further comprising a splash wall disposed adjacent to the substrate medium, the splash wall being covered by the waterproof membrane wherein the splash wall has a splash wall void.
 20. The water drainage system of claim 19, wherein the waterproof membrane is folded and the fold-up portions of the waterproof membrane is disposed on the splash wall void. 